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html validation confusion

hii folks i m fixing someone website. i never got errors from website i make but this is like optimizing i got these error but i m confused e.g this error

Code HTML4Strict:

Line 342, Column 8: element "CENTER" undefined. Did you mean "center"?
<center>✉
You have used the element named above in your document, but the document type you are using does not define an element of that name. This error is often caused by:
* incorrect use of the "Strict" document type with a document that uses frames (e.g. you must use the "Frameset" document type to get the "<frameset>" element),
* by using vendor proprietary extensions such as "<spacer>" or "<marquee>" (this is usually fixed by using CSS to achieve the desired effect instead).
* by using upper-case tags in XHTML (in XHTML attributes and elements must be all lower-case).

and

Code HTML4Strict:

Line 325, Column 30: required attribute "TYPE" not specified
<SCRIPTLANGUAGE="JavaScript">✉
The attribute given above is required for an element that you've used, but you have omitted it. For instance, in most HTML and XHTML document types the "type" attribute is required on the "script" element and the "alt" attribute is required for the "img" element.
Typical values for type are type="text/css" for <style> and type="text/javascript" for <script>.